Practice Worked Example: Concentration from Calibration Curve - 1.5.3 | Unit 11: Measurement and Data Processing | IB Grade 11: Chemistry
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1.5.3 - Worked Example: Concentration from Calibration Curve

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the absorption equation used to determine concentration?

💡 Hint: Identify the variables involved.

Question 2

Easy

If the slope (m) is 2.0 and intercept (b) is 0, what is the concentration for an absorbance of 0.6?

💡 Hint: Rearrange the absorption equation.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does A stand for in the equation A = mC + b?

  • Abundance
  • Absorbance
  • Area

💡 Hint: Think about the basic measurements in spectrometry.

Question 2

True or False: The slope of the calibration curve decreases as concentration increases.

  • True
  • False

💡 Hint: Consider how absorbance relates to concentration.

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Challenge Problems

Push your limits with challenges.

Question 1

A sample measured absorbance of 0.750 with a slope of 1.500 ± 0.020 and an intercept of 0.050 ± 0.005. Determine the concentration and its associated uncertainty, providing all calculations done.

💡 Hint: Use derivative methods for propagating uncertainties.

Question 2

If you had a linear calibration curve but when plotting values you found deviations at high concentrations, what methods could you use to correct this and ensure reliability?

💡 Hint: Think about how to adjust your measurements to fit within regard of Beer’s law.

Challenge and get performance evaluation